2N Lift8 v1.6.0 - Manual (Page 169)

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2N TELEKOMUNIKACE a.s., www.2n.cz
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Caution
Set the MaxLifts and MaxUser TCP connections manually to make a licence
with a higher count of these connection work properly.
Warning
Make sure while using the application that the server ID has not changed.
This identifier is also generated from the MAC address of the primary
network card. If you install or launch the VPN software or the primary
network card changes, the server ID will change. As a result, the existing
licence will become invalid and you will not be able to log in to the server!